11575969121 has 4 divisors (see below), whose sum is σ = 11975140500. Its totient is φ = 11176797744.

The previous prime is 11575969117. The next prime is 11575969123. The reversal of 11575969121 is 12196957511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12196957511 = 12097 ⋅1008263.

It can be written as a sum of positive squares in 2 ways, for example, as 6681427600 + 4894541521 = 81740^2 + 69961^2 .

It is a cyclic number.

It is not a de Polignac number, because 11575969121 - 2² = 11575969117 is a prime.

It is a super-2 number, since 2×11575969121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11575969123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199585646 + ... + 199585703.

It is an arithmetic number, because the mean of its divisors is an integer number (2993785125).

Almost surely, 2^11575969121 is an apocalyptic number.

It is an amenable number.

11575969121 is a deficient number, since it is larger than the sum of its proper divisors (399171379).

11575969121 is an equidigital number, since it uses as much as digits as its factorization.

11575969121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399171378.

The product of its digits is 170100, while the sum is 47.

The spelling of 11575969121 in words is "eleven billion, five hundred seventy-five million, nine hundred sixty-nine thousand, one hundred twenty-one".